the right heads!

BTW: What is the machinist asking for that set of J heads and does he have any hard flow numbers for them? If the cost is close to a set of aftermarkets and you think you may want more out of the motor at a later date, then it might just be a matter of Stage 1ing, 2ing or 3ing an aftermarket set at that time. The OEMS will stall at a certain point but you need to figure out if you need/want to go beyond what they can offer.